Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 491182
Title Response of tomato crop growth and development to a vertical temperature gradient in a semi-closed greenhouse
Author(s) Qian, T.; Dieleman, J.A.; Elings, A.; Gelder, A. de; Marcelis, L.F.M.
Source Journal of Horticultural Science and Biotechnology 90 (2015)5. - ISSN 1462-0316 - p. 578 - 584.
Department(s) Horticultural Supply Chains
GTB Teelt & Gewasfysiologie
WUR GTB Teelt & Bedrijfssystemen
Horticulture & Product Physiology
WUR GTB Gewasfysiologie Management en Model
Publication type Refereed Article in a scientific journal
Publication year 2015
Abstract Semi-closed greenhouses have been developed over the last decade to conserve energy. Energy consumption is reduced by collecting the excess solar energy in Summer, storing it in aquifers and re-using it in Winter to heat the greenhouse. Cooling systems placed in the lower part of the greenhouse, can cause vertical temperature gradients, which can be more than 5ºC at high levels of solar radiation. Given the substantial effect that air temperature has on a number of plant physiological processes, we expected to observe effects on plant growth and fruit production. Tomato plants were grown in semi-closed greenhouses with or without a vertical temperature gradient. The gradient was most pronounced from June to September when, for 55% of the time, the temperature difference between the top and bottom of the canopy was > 2ºC, and for 20% of the time the difference was > 5ºC. Despite these large vertical temperature gradients, plant growth and fruit yields were mostly unaffected. Leaf and truss initiation rates did not differ between treatments, since air temperatures at the top of the canopy were comparable. The only observed response of plants to the vertical temperature gradient was a reduced rate of fruit development in the lower part of the canopy. This resulted in a longer time between anthesis and fruit harvest in the treatment with a vertical temperature gradient, and an increase in the average fruit weight in Summer. However, total fruit production over the whole season was not affected. These results are important when designing greenhouses, as well as heating and cooling systems for greenhouses.
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